170417-N-RL456-0206 MAYPORT, Fla. (April 17, 2017) Sailors assigned to the amphibious assault ship USS Iwo Jima (LHD 7) use alternative cardio machines to conduct the bi-annual Navy physical readiness test at the Naval Station Mayport base gym. Iwo Jima is currently conducting a scheduled continued maintenance availability. (U.S. Navy photo by Mass Communication Specialist 2nd Class Hunter S. Harwell/Released)